[PATCH]: cmd: part: add part block command

The Intel Edison OTA process requires a conversion of data size from bytes to number of blocks. The following functions are used:

# function ota_conv_sizes # Convert a bytes size to a block size # input bytesize : size in bytes to convert # input blksize : size of a block in bytes # output num_blk : converted size in blocks

# function ota_mmc_write # Write a memory buffer to mmc drive # input floadaddr : address of buffer to write # input u_part_start : block start in mmc # input num_blk : number of block to write

This patch adds the cmd part sub-command 'block' which returns the partition block size in bytes.